GA4 – call event via javascript working BUT send two event

When I use gtag to send an event, it works but too much :/
1 call = two call and to events on GA4 :/

GA4 installed alone.

This is my javascript test :

<script>
    $('#form').on('submit',function(){
            console.log('form_send.1');
            gtag("event", "form_send_ok");
            console.log('form_send.2');
    }
</script>

With chrome console :
On my network panel I got two line with google.com/g/collect?
On my console log I got only one :
form_send.1
form_send.2

The two line in my network are not exactly the same, first finish by ‘_et=1’, second by ‘_et=2’
The event is counted twice in GA.

• If,in the console I put gtag(“event”, “form_send_ok”); same thing, two call to ga4.
• I check without extension on edge, same thing.
• If you want try to fire an event on my website be my guest : usa.nacel.es

If someone have an idea please speak 🙂
Thank you for your help